who uses red sea test kits (po4)

[asylumdown]

I just tossed my red sea phosphate test kit in the garbage. I found that the colour that would develop in my test kit never matched any of the colours on the colour wheel. Like not even in the same colour family. Whereas some tests it's hard to tell I've been using the hanna checker for phosphates and find it to be incredibly sensitive to micro bubbles. So long as you make sure that the micro bubbles have dissipated (which you sometimes can't actually do in the 3 minute reaction time they give you), it's pretty consistent. But bubbles can be the difference between 0.00 and 0.05ppm readings.

I'm going to get the hanna range kit shortly.